I usually sudo -i first then I run the command and you don't get permission 
denied. 
You could also run it the same way as
echo 255 | sudo tee -a 
/sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness

Both work, I like your path better cause its shorter.

-- 
[Jaunty] MacBook 5.1 keyboard backlight not supported
https://bugs.launchpad.net/bugs/337945
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